US20130343552A1 - Circuit for testing buzzer - Google Patents
Circuit for testing buzzer Download PDFInfo
- Publication number
- US20130343552A1 US20130343552A1 US13/910,214 US201313910214A US2013343552A1 US 20130343552 A1 US20130343552 A1 US 20130343552A1 US 201313910214 A US201313910214 A US 201313910214A US 2013343552 A1 US2013343552 A1 US 2013343552A1
- Authority
- US
- United States
- Prior art keywords
- circuit
- amplifier
- coupled
- amplified signal
- microprocessor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/008—Visual indication of individual signal levels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
- G01H3/04—Frequency
- G01H3/06—Frequency by electric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
- G01H3/10—Amplitude; Power
- G01H3/12—Amplitude; Power by electric means
Definitions
- the present disclosure relates to a circuit for testing a buzzer.
- a buzzer, or a speaker arranged on a motherboard, is employed to sound when components of the motherboard malfunction. Accordingly, it is critical to test whether the buzzer is operating or not. However, the test is usually completed by hearing the sound from the buzzer, which may be inaccurate.
- FIG. 1 is a block diagram of an embodiment of a circuit for testing a buzzer of the present disclosure, wherein the circuit includes a microphone, an amplifier circuit, a gain circuit, a microprocessor circuit, a display circuit, and an interface circuit.
- FIG. 2 is a circuit diagram of the amplifier circuit and microphone of FIG. 1 .
- FIG. 3 is a circuit diagram of the gain circuit of FIG. 1 .
- FIG. 4 is a circuit diagram of the microprocessor circuit of FIG. 1 .
- FIG. 5 is a circuit diagram of the display circuit of FIG. 1 .
- FIG. 6 is a circuit diagram of the interface circuit of FIG. 1 .
- FIG. 1 illustrates an embodiment of a circuit for testing a buzzer 20 of the present disclosure.
- the circuit includes a microphone 10 , an amplifier circuit 30 , a gain circuit 40 , a microprocessor circuit 50 , an interface circuit 90 , and a display circuit 100 .
- FIG. 2 shows that a cathode of the microphone 10 is connected to ground.
- An anode of the microphone 10 is configured to output an analog signal corresponding to a sound having a certain loudness generated by the buzzer 20 upon a condition that the buzzer 20 receives an audio signal from the microprocessor circuit 50 .
- the amplifier circuit 30 is configured to amplify the analog signal from the microphone 10 , to output an amplified signal.
- the amplifier circuit 30 includes two amplifiers U 1 and U 2 , ten resistors R 1 -R 9 and R 20 , and five capacitors C 1 -C 5 .
- An inverting terminal of the amplifier U 1 is coupled to a power terminal VDD through the resistor R 3 , and is connected to ground through the resistor R 5 .
- a power terminal of the amplifier U 1 is coupled to the power terminal VDD, and is connected to ground through the capacitor C 2 .
- a non-inverting terminal of the amplifier U 1 is coupled to the anode of the microphone 20 through the capacitor C 1 , connected to the power terminal VDD through the resistor R 2 , and connected to ground through the resistor R 4 .
- the anode of the microphone 10 is coupled to the power terminal VDD through the resistor R 1 .
- An output terminal of the amplifier U 1 is coupled to an inverting terminal of the amplifier U 2 through the resistor R 20 , and is also coupled to the inverting terminal of the amplifier U 1 through the resistor R 6 .
- the inverting terminal of the amplifier U 2 is connected to ground through the resistor R 9 and capacitor C 4 in that order, and is connected to ground through the capacitor C 3 , the resistors R 7 and R 8 , and the capacitor C 4 in that order.
- a non-inverting terminal of the amplifier U 2 is coupled to the non-inverting terminal of the amplifier U 1 .
- a power terminal of the amplifier U 2 is connected to ground through the capacitor C 5 , and is connected to the power terminal VDD.
- a ground terminal of the amplifier U 2 is grounded.
- An output terminal of the amplifier U 2 is configured to output the amplified signal.
- FIG. 3 shows that the gain circuit 40 is configured to re-amplify the amplified signal output from the amplifier circuit 30 .
- the gain circuit 40 includes a rheostat P 1 , a comparator U 3 , two resistors R 11 and R 12 , and a capacitor C 6 .
- a voltage reference pin IN ⁇ of the comparator U 3 is coupled to a wiper end of the rheostat P 1 .
- a ground pin GND of the comparator U 3 is connected to ground.
- a first end of the rheostat P 1 is coupled to the power terminal VDD.
- a second end of the rheostat P 1 is connected to ground.
- a power pin VCC of the comparator U 3 is coupled to the power terminal VDD, and is also connected to ground through the capacitor C 6 .
- An input pin IN+ of the comparator U 3 is coupled to the output terminal of the amplifier U 2 through the resistor R 11 .
- An output pin OUT of the comparator U 3 is configured to output a re-amplified signal.
- the gain circuit 40 is configured to re-amplify the amplified signal with a low frequency from the amplifier circuit 30 , to improve accuracy of sampling for the microprocessor circuit 50 .
- the microprocessor circuit 50 may directly sample the amplified signal from the amplifier circuit 50 when the amplified signal has a high frequency.
- FIG. 4 shows that the microprocessor circuit 50 includes a microprocessor U 4 , a voltage regulator chip U 5 , a diode D 1 , three resistors R 10 , R 13 , and R 14 , and three capacitors C 7 , C 8 , and C 10 .
- a first power pin MCLR of the microprocessor U 4 is coupled to the power terminal VDD through the resistors R 14 and R 13 in that order, and is connected to ground through the resistor R 14 and the capacitor C 7 in that order.
- a cathode of the diode D 1 is coupled to the power terminal VDD, and an anode of the diode D 1 is coupled to a node between the resistors R 13 and R 14 .
- a voltage reference pin RA 1 of the microprocessor U 4 is coupled to an output pin OUT of the voltage regulator chip U 5 .
- An input pin IN of the voltage regulator chip U 5 is coupled to the power terminal VDD.
- a ground pin GND of the voltage regulator chip U 5 is connected to ground.
- a second power pin VDD_ 1 of the microprocessor U 4 is coupled to the power terminal VDD, and is connected to ground through the capacitor C 8 .
- the voltage regulator chip U 5 outputs a reference voltage to the voltage reference pin RA 1 of the microprocessor U 4 , to enable the microprocessor U 4 to perform analog to digital (A/D) conversion operation.
- a third power pin VDD_ 2 of the microprocessor U 4 is coupled to the power terminal VDD, and is connected to ground through the capacitor C 10 .
- a ground pin VSS_ 2 of the microprocessor U 4 is connected to ground.
- An A/D conversion pin RA 0 of the microprocessor U 4 is coupled to the output terminal of the amplifier U 2 , to obtain a loudness corresponding to the amplified signal.
- a first frequency pin RA 2 of the microprocessor U 4 is coupled to the output terminal of the amplifier U 2 through the resistor R 10 , to receive the amplified signal from the amplifier unit 30 , and obtain a frequency corresponding to the amplified signal.
- a second frequency pin RC 1 of the microprocessor U 4 is coupled to the output pin OUT of the comparator U 3 , to receive the re-amplified signal, and obtains a frequency corresponding to the re-amplified signal.
- the microprocessor U 4 determines whether the amplified signal is a high frequency. The microprocessor U 4 will sample the amplified signal if the amplified signal has a high frequency, and will sample the re-amplified signal if the amplified signal has a low frequency.
- the microprocessor U 4 pre-stores the loudness and the frequency of a file, and outputs the audio signal corresponding to the file to be played by the buzzer 20 .
- the microprocessor U 4 determines whether the loudness and the frequency of the amplifier signal or the re-amplifier signal is within a proper range. For example, the microprocessor U 4 determines the loudness of the amplifier signal or the re-amplifier signal is within a first predetermined range, and determines the frequency of the amplifier signal or the re-amplifier signal is within a second predetermined range.
- the buzzer 20 is qualified when the loudness of the amplified signal or re-amplified signal is within the first predetermined range and the frequency of the amplified signal or re-amplified signal is within the second predetermined range. Otherwise, if at least one of the loudness of the amplified signal or re-amplified signal is not within the first predetermined range and at least one of the frequency of the amplified signal or re-amplified signal is not within the second predetermined range, the buzzer 30 is unqualified.
- FIG. 5 shows that the display circuit 100 is configured to display the test result of whether the buzzer 20 is qualified or unqualified, and the loudness and the frequency.
- the display circuit 100 includes a display chip LED 1 , a rheostat P 2 , and a resistor R 13 .
- a pin VEE of the display chip LED 1 is coupled to a wiper end of the rheostat P 2 .
- a first end of the rheostat P 2 is coupled to the pin VEE, and a second end of the rheostat P 2 is grounded.
- a power pin VCC of the display chip LED 1 is coupled to the power terminal VDD.
- a pin L ⁇ of the display chip LED 1 is coupled to the power terminal VDD through the resistor R 13 .
- a pin L+ of the display chip LED 1 is grounded.
- Eight data pins DATA 0 -DATA 7 of the display chip LED 1 are respectively coupled to eight data pins RD 0 -RD 7 of the microprocessor U 4 .
- Three control pins RS, R/W, and E of the display chip LED 1 are respectively coupled to three control pins RE 0 , RE 1 , and RE 2 .
- FIG. 6 shows that the interface circuit 90 includes a universal serial bus (USB) interface chip USB 1 .
- a power terminal VCC_ 2 of the USB interface chip USB 1 is coupled to the power terminal VDD.
- a ground pin GND of the USB interface chip USB 1 is connected to ground.
- Two data pins D+ and D ⁇ of the USB interface chip USB 1 are respectively coupled to two data pins D+ and D ⁇ of the microprocessor U 4 .
- the interface circuit 90 is employed to transmit the test result, the loudness, and/or the frequency to a computer.
Abstract
Description
- 1. Technical Field
- The present disclosure relates to a circuit for testing a buzzer.
- 2. Description of Related Art
- A buzzer, or a speaker arranged on a motherboard, is employed to sound when components of the motherboard malfunction. Accordingly, it is critical to test whether the buzzer is operating or not. However, the test is usually completed by hearing the sound from the buzzer, which may be inaccurate.
- Therefore, there is room for improvement in the art.
- Many aspects of the present disclosure can be better understood with reference to the following drawing(s). The components in the drawing(s) are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawing(s), like reference numerals designate corresponding parts throughout the several views.
-
FIG. 1 is a block diagram of an embodiment of a circuit for testing a buzzer of the present disclosure, wherein the circuit includes a microphone, an amplifier circuit, a gain circuit, a microprocessor circuit, a display circuit, and an interface circuit. -
FIG. 2 is a circuit diagram of the amplifier circuit and microphone ofFIG. 1 . -
FIG. 3 is a circuit diagram of the gain circuit ofFIG. 1 . -
FIG. 4 is a circuit diagram of the microprocessor circuit ofFIG. 1 . -
FIG. 5 is a circuit diagram of the display circuit ofFIG. 1 . -
FIG. 6 is a circuit diagram of the interface circuit ofFIG. 1 . -
FIG. 1 illustrates an embodiment of a circuit for testing abuzzer 20 of the present disclosure. The circuit includes amicrophone 10, anamplifier circuit 30, again circuit 40, amicroprocessor circuit 50, aninterface circuit 90, and adisplay circuit 100. -
FIG. 2 shows that a cathode of themicrophone 10 is connected to ground. An anode of themicrophone 10 is configured to output an analog signal corresponding to a sound having a certain loudness generated by thebuzzer 20 upon a condition that thebuzzer 20 receives an audio signal from themicroprocessor circuit 50. - The
amplifier circuit 30 is configured to amplify the analog signal from themicrophone 10, to output an amplified signal. Theamplifier circuit 30 includes two amplifiers U1 and U2, ten resistors R1-R9 and R20, and five capacitors C1-C5. An inverting terminal of the amplifier U1 is coupled to a power terminal VDD through the resistor R3, and is connected to ground through the resistor R5. A power terminal of the amplifier U1 is coupled to the power terminal VDD, and is connected to ground through the capacitor C2. A non-inverting terminal of the amplifier U1 is coupled to the anode of themicrophone 20 through the capacitor C1, connected to the power terminal VDD through the resistor R2, and connected to ground through the resistor R4. The anode of themicrophone 10 is coupled to the power terminal VDD through the resistor R1. An output terminal of the amplifier U1 is coupled to an inverting terminal of the amplifier U2 through the resistor R20, and is also coupled to the inverting terminal of the amplifier U1 through the resistor R6. The inverting terminal of the amplifier U2 is connected to ground through the resistor R9 and capacitor C4 in that order, and is connected to ground through the capacitor C3, the resistors R7 and R8, and the capacitor C4 in that order. A non-inverting terminal of the amplifier U2 is coupled to the non-inverting terminal of the amplifier U1. A power terminal of the amplifier U2 is connected to ground through the capacitor C5, and is connected to the power terminal VDD. A ground terminal of the amplifier U2 is grounded. An output terminal of the amplifier U2 is configured to output the amplified signal. -
FIG. 3 shows that thegain circuit 40 is configured to re-amplify the amplified signal output from theamplifier circuit 30. Thegain circuit 40 includes a rheostat P1, a comparator U3, two resistors R11 and R12, and a capacitor C6. A voltage reference pin IN− of the comparator U3 is coupled to a wiper end of the rheostat P1. A ground pin GND of the comparator U3 is connected to ground. A first end of the rheostat P1 is coupled to the power terminal VDD. A second end of the rheostat P1 is connected to ground. A power pin VCC of the comparator U3 is coupled to the power terminal VDD, and is also connected to ground through the capacitor C6. An input pin IN+ of the comparator U3 is coupled to the output terminal of the amplifier U2 through the resistor R11. An output pin OUT of the comparator U3 is configured to output a re-amplified signal. In the embodiment, thegain circuit 40 is configured to re-amplify the amplified signal with a low frequency from theamplifier circuit 30, to improve accuracy of sampling for themicroprocessor circuit 50. In other embodiments, themicroprocessor circuit 50 may directly sample the amplified signal from theamplifier circuit 50 when the amplified signal has a high frequency. -
FIG. 4 shows that themicroprocessor circuit 50 includes a microprocessor U4, a voltage regulator chip U5, a diode D1, three resistors R10, R13, and R14, and three capacitors C7, C8, and C10. A first power pin MCLR of the microprocessor U4 is coupled to the power terminal VDD through the resistors R14 and R13 in that order, and is connected to ground through the resistor R14 and the capacitor C7 in that order. A cathode of the diode D1 is coupled to the power terminal VDD, and an anode of the diode D1 is coupled to a node between the resistors R13 and R14. A voltage reference pin RA1 of the microprocessor U4 is coupled to an output pin OUT of the voltage regulator chip U5. An input pin IN of the voltage regulator chip U5 is coupled to the power terminal VDD. A ground pin GND of the voltage regulator chip U5 is connected to ground. A second power pin VDD_1 of the microprocessor U4 is coupled to the power terminal VDD, and is connected to ground through the capacitor C8. The voltage regulator chip U5 outputs a reference voltage to the voltage reference pin RA1 of the microprocessor U4, to enable the microprocessor U4 to perform analog to digital (A/D) conversion operation. A third power pin VDD_2 of the microprocessor U4 is coupled to the power terminal VDD, and is connected to ground through the capacitor C10. A ground pin VSS_2 of the microprocessor U4 is connected to ground. - An A/D conversion pin RA0 of the microprocessor U4 is coupled to the output terminal of the amplifier U2, to obtain a loudness corresponding to the amplified signal. A first frequency pin RA2 of the microprocessor U4 is coupled to the output terminal of the amplifier U2 through the resistor R10, to receive the amplified signal from the
amplifier unit 30, and obtain a frequency corresponding to the amplified signal. A second frequency pin RC1 of the microprocessor U4 is coupled to the output pin OUT of the comparator U3, to receive the re-amplified signal, and obtains a frequency corresponding to the re-amplified signal. In one embodiment, the microprocessor U4 determines whether the amplified signal is a high frequency. The microprocessor U4 will sample the amplified signal if the amplified signal has a high frequency, and will sample the re-amplified signal if the amplified signal has a low frequency. - The microprocessor U4 pre-stores the loudness and the frequency of a file, and outputs the audio signal corresponding to the file to be played by the
buzzer 20. The microprocessor U4 determines whether the loudness and the frequency of the amplifier signal or the re-amplifier signal is within a proper range. For example, the microprocessor U4 determines the loudness of the amplifier signal or the re-amplifier signal is within a first predetermined range, and determines the frequency of the amplifier signal or the re-amplifier signal is within a second predetermined range. Thebuzzer 20 is qualified when the loudness of the amplified signal or re-amplified signal is within the first predetermined range and the frequency of the amplified signal or re-amplified signal is within the second predetermined range. Otherwise, if at least one of the loudness of the amplified signal or re-amplified signal is not within the first predetermined range and at least one of the frequency of the amplified signal or re-amplified signal is not within the second predetermined range, thebuzzer 30 is unqualified. -
FIG. 5 shows that thedisplay circuit 100 is configured to display the test result of whether thebuzzer 20 is qualified or unqualified, and the loudness and the frequency. Thedisplay circuit 100 includes a display chip LED1, a rheostat P2, and a resistor R13. A pin VEE of the display chip LED1 is coupled to a wiper end of the rheostat P2. A first end of the rheostat P2 is coupled to the pin VEE, and a second end of the rheostat P2 is grounded. A power pin VCC of the display chip LED1 is coupled to the power terminal VDD. A pin L− of the display chip LED1 is coupled to the power terminal VDD through the resistor R13. A pin L+ of the display chip LED1 is grounded. Eight data pins DATA0-DATA7 of the display chip LED1 are respectively coupled to eight data pins RD0-RD7 of the microprocessor U4. Three control pins RS, R/W, and E of the display chip LED1 are respectively coupled to three control pins RE0, RE1, and RE2. -
FIG. 6 shows that theinterface circuit 90 includes a universal serial bus (USB) interface chip USB1. A power terminal VCC_2 of the USB interface chip USB1 is coupled to the power terminal VDD. A ground pin GND of the USB interface chip USB1 is connected to ground. Two data pins D+ and D− of the USB interface chip USB1 are respectively coupled to two data pins D+ and D− of the microprocessor U4. Theinterface circuit 90 is employed to transmit the test result, the loudness, and/or the frequency to a computer. - While the disclosure has been described by way of example and in terms of preferred embodiment, it is to be understood that the disclosure is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements as would be apparent to those skilled in the art. Therefore, the range of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN2012102067350 | 2012-06-21 | ||
CN201210206735.0A CN103512650A (en) | 2012-06-21 | 2012-06-21 | Buzzer testing circuit |
Publications (1)
Publication Number | Publication Date |
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US20130343552A1 true US20130343552A1 (en) | 2013-12-26 |
Family
ID=49774480
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/910,214 Abandoned US20130343552A1 (en) | 2012-06-21 | 2013-06-05 | Circuit for testing buzzer |
Country Status (4)
Country | Link |
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US (1) | US20130343552A1 (en) |
JP (1) | JP2014006253A (en) |
CN (1) | CN103512650A (en) |
TW (1) | TW201401265A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140200695A1 (en) * | 2011-06-22 | 2014-07-17 | Tendyron Corporation | Audio signal receiving device and system for transmitting audio signal, audio signal receiver device, audio signal transmission system |
US20150036837A1 (en) * | 2011-07-18 | 2015-02-05 | Tendyron Corporation | Audio signal adapter device and audio signal transmission system |
US20160098242A1 (en) * | 2013-06-26 | 2016-04-07 | Fujitsu Technology Solutions Intellectual Property Gmbh | Motherboard for a computer system and a computer system |
CN107733896A (en) * | 2017-10-20 | 2018-02-23 | 哈尔滨工程大学 | A kind of data safe transmission method based on sound wave |
US11153043B2 (en) * | 2019-10-24 | 2021-10-19 | Roku, Inc. | Measuring and evaluating a test signal generated by a device under test (DUT) |
CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103743984B (en) * | 2014-01-23 | 2016-05-18 | 中铁一局集团有限公司 | A kind of track traffic interlocking of signals experiment simulator |
CN104330152A (en) * | 2014-11-25 | 2015-02-04 | 重庆矢崎仪表有限公司 | Buzzer sound testing circuit |
CN109085440B (en) * | 2018-09-25 | 2020-04-28 | 华南理工大学 | Automatic detection method for electrical property of buzzer |
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US4492917A (en) * | 1981-09-03 | 1985-01-08 | Victor Company Of Japan, Ltd. | Display device for displaying audio signal levels and characters |
US5392381A (en) * | 1989-01-27 | 1995-02-21 | Yamaha Corporation | Acoustic analysis device and a frequency conversion device used therefor |
US20030187636A1 (en) * | 2002-03-30 | 2003-10-02 | Klippel Gmbh | Signal distortion measurement and assessment system and method |
US20090304195A1 (en) * | 2006-07-13 | 2009-12-10 | Regie Autonome Des Transpors Parisiens | Method and device for diagnosing the operating state of a sound system |
US8831233B2 (en) * | 2009-09-28 | 2014-09-09 | Kabushiki Kaisha Toshiba | Monitoring apparatus and method |
-
2012
- 2012-06-21 CN CN201210206735.0A patent/CN103512650A/en active Pending
- 2012-06-26 TW TW101122898A patent/TW201401265A/en unknown
-
2013
- 2013-06-05 US US13/910,214 patent/US20130343552A1/en not_active Abandoned
- 2013-06-19 JP JP2013128383A patent/JP2014006253A/en active Pending
Patent Citations (5)
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US4492917A (en) * | 1981-09-03 | 1985-01-08 | Victor Company Of Japan, Ltd. | Display device for displaying audio signal levels and characters |
US5392381A (en) * | 1989-01-27 | 1995-02-21 | Yamaha Corporation | Acoustic analysis device and a frequency conversion device used therefor |
US20030187636A1 (en) * | 2002-03-30 | 2003-10-02 | Klippel Gmbh | Signal distortion measurement and assessment system and method |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140200695A1 (en) * | 2011-06-22 | 2014-07-17 | Tendyron Corporation | Audio signal receiving device and system for transmitting audio signal, audio signal receiver device, audio signal transmission system |
US20150036837A1 (en) * | 2011-07-18 | 2015-02-05 | Tendyron Corporation | Audio signal adapter device and audio signal transmission system |
US9357297B2 (en) * | 2011-07-18 | 2016-05-31 | Tendyron Corporation | Audio signal adapter device and system for transmitting audio signal |
US20160098242A1 (en) * | 2013-06-26 | 2016-04-07 | Fujitsu Technology Solutions Intellectual Property Gmbh | Motherboard for a computer system and a computer system |
CN107733896A (en) * | 2017-10-20 | 2018-02-23 | 哈尔滨工程大学 | A kind of data safe transmission method based on sound wave |
US11153043B2 (en) * | 2019-10-24 | 2021-10-19 | Roku, Inc. | Measuring and evaluating a test signal generated by a device under test (DUT) |
US11632200B2 (en) | 2019-10-24 | 2023-04-18 | Roku, Inc. | Measuring and evaluating a test signal generated by a device under test (DUT) |
CN113784257A (en) * | 2021-09-08 | 2021-12-10 | 深圳市长丰影像器材有限公司 | Multifunctional microphone |
Also Published As
Publication number | Publication date |
---|---|
CN103512650A (en) | 2014-01-15 |
JP2014006253A (en) | 2014-01-16 |
TW201401265A (en) | 2014-01-01 |
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Owner name: HONG FU JIN PRECISION INDUSTRY (SHENZHEN) CO., LTD Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XIAO, GUI-FU;YIN, XIAO-GANG;ZHANG, WAN-HONG;REEL/FRAME:030547/0712 Effective date: 20130603 Owner name: HON HAI PRECISION INDUSTRY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:XIAO, GUI-FU;YIN, XIAO-GANG;ZHANG, WAN-HONG;REEL/FRAME:030547/0712 Effective date: 20130603 |
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